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Phosphorus modulated porous CeO2 nanocrystallines for accelerated polysulfide catalysis in advanced Li-S batteries
Ist Teil von
Journal of materials science & technology, 2022-12, Vol.131, p.212-220
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
•Phosphorus modulated porous cerium oxide (P-CeO2) nanocrystallines was constructed through a fine phosphorization for advanced LSBs.•P-CeO2 cathode present stronger adsorption of Li2S6, faster oxidation-reduction kinetics of LiPS, and quicker diffusion of Li+ ions than the bare CeO2, thus exhibited an improved initial capacity and stable cycling behavior.•P-modulation of metal oxide surface can simultaneously promote the catalytic reaction kinetics and chemical interaction of LiPS.
The insulating nature of sulfur species, sluggish reaction kinetics, and uncontrolled dissolution of lithium polysulfide (LiPS) intermediates during the complex and multiphase sulfur redox process, have severely inhibited the applications of Li-S batteries. In this study, we report a rational strategy to accelerate the polysulfide catalysis via constructing phosphorus modulated porous CeO2 (P-CeO2) for advanced Li-S batteries. The morphology and surface analysis demonstrate that the P-CeO2 consists of abundant P-modulated porous CeO2 nanocrystallines. The battery performance reveals that the introduction of P will lead to an improved initial capacity of 1027 mA h g−1 than that of bare CeO2 (895.7 mA h g−1) at 0.2 C. In addition, the P-CeO2 cathode can maintain a low capacity decay ratio of 0.10% per cycle after 500 cycles at 1.0 C. The coin battery tests suggest that the P-CeO2 cathode presents faster oxidation-reduction kinetics of LiPS and quick diffusion of Li+ ions. Meanwhile, the studies of redox processes and chemical interactions of LiPS have demonstrated the P-CeO2 cathode displays stronger adsorption of Li2S6, higher redox peak current, and earlier precipitation of Li2S than the bare CeO2. This study demonstrates for the first time that the P-modulation of metal oxide surface can simultaneously promote the catalytic reaction kinetics and chemical interaction of LiPS. We anticipate that this P-modulation method can be extended to many other nanostructured metal catalytic sites for developing affordable advanced Li-S batteries.